...the yogi went into his hut momentarily and came back to the door smiling. "I cannot go with you, but take this lantern. It will illumine your way." Looking forlorn, the traveler held the lantern aloft and said, "But I cannot find my way with this lantern. Its light shines only ten feet ahead and I have a journey of miles to complete." The yogi replied, "Walk ten feet, and you will be able to see another ten. And when you have walked ten more feet, yet another ten will be illumined. So ten feet by ten feet, you will reach you destination."
story taken from Kripalu Yoga - A Guide to Practice On and Off the Mat, by Richard Faulds